full log here: https://paste.ee/p/PTV38

java.lang.RuntimeException: Could not execute entrypoint stage 'main' due to errors, provided by 'mythicmetals'!
at net.fabricmc.loader.impl.entrypoint.EntrypointUtils.lambda$invoke0$0(EntrypointUtils.java:51)
at net.fabricmc.loader.impl.util.ExceptionUtil.gatherExceptions(ExceptionUtil.java:33)
at net.fabricmc.loader.impl.entrypoint.EntrypointUtils.invoke0(EntrypointUtils.java:49)
at net.fabricmc.loader.impl.entrypoint.EntrypointUtils.invoke(EntrypointUtils.java:35)
at net.fabricmc.loader.impl.game.minecraft.Hooks.startClient(Hooks.java:52)
at net.minecraft.class_310.(class_310.java:459)
at net.minecraft.client.main.Main.method_44604(Main.java:205)
at net.minecraft.client.main.Main.main(Main.java:51)
at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:461)
at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74)
at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:568)
at org.multimc.onesix.OneSixLauncher.launchWithMainClass(OneSixLauncher.java:210)
at org.multimc.onesix.OneSixLauncher.launch(OneSixLauncher.java:245)
at org.multimc.EntryPoint.listen(EntryPoint.java:143)
at org.multimc.EntryPoint.main(EntryPoint.java:34)
Caused by: java.lang.NoSuchMethodError: 'void net.minecraft.class_1813.(int, net.minecraft.class_3414, net.minecraft.class_1792$class_1793)'
at nourl.mythicmetals.item.MythicItems$CustomMusicDiscItem.(MythicItems.java:165)
at nourl.mythicmetals.tools.MythicTools$Frogery.(MythicTools.java:117)
at nourl.mythicmetals.tools.MythicTools.afterFieldProcessing(MythicTools.java:88)
at io.wispforest.owo.registration.reflect.FieldRegistrationHandler.processSimple(FieldRegistrationHandler.java:55)
at nourl.mythicmetals.MythicMetals.onInitialize(MythicMetals.java:59)
at net.fabricmc.loader.impl.entrypoint.EntrypointUtils.invoke0(EntrypointUtils.java:47)
... 16 more

You are using a 1.19 ONLY build on 1.19.2.
Please downgrade to 0.15.4.